TBR Physics Exam 1.2 #9 Change in momentum

As a hot-air balloon ascends upward at a constant speed, a package is dropped out of the balloon. At the instant the package is released, the momentum of the balloon: A.) increases B.) decreases C.) is unaffected because the force does not change D.) is unaffected because the decrease in mass is compensated by an increase in velocity The answer is A. I couldn't choose an answer because: p=mv, so how do we know if the change in speed is large enough to offset the loss in mass? Or since the... TBR Physics Exam 1.2 #9 Change in momentum
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